exocyclic

an exocyclic double bond.

环外一对化学键

Two new exocyclic ring-fused boron-dipyrromethene (BDP) dyes with benzo crown ether subunit at meso-position were prepared.Their spectroscopic and electrochemical properties were investigated.

本文报道了两种中位为苯并冠醚单元取代含稠合外环-吡咯甲基合成、光谱和电化学性质。